US9815734B2ActiveUtilityPatentIndex 37
Solarization-stable UV band-pass filter
Est. expiryDec 12, 2034(~8.4 yrs left)· nominal 20-yr term from priority
C03C 3/108C03C 3/087C03C 4/08C03C 4/0085C03C 3/091C03C 1/004
37
PatentIndex Score
0
Cited by
9
References
19
Claims
Abstract
Optical glass filters are provided that include a filter glass showing an optimized transmission spectrum which has a high transmission in the wave length range of 300 to 400 nm and a very low transmission in the visible wave length range. The glass has an especially high optical quality and is excellently suitable as an optical filter for generating UV light without a proportion of visible light. The optical glass filters include the components nickel oxide and cobalt oxide.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. An optical glass filter, comprising a filter glass including following composition (in % by weight, based on oxides):
SiO 2
45-75;
B 2 O 3
0-5;
Al 2 O 3
0-5;
Na 2 O
0.3-15;
K 2 O
2-20;
CaO
0-15;
BaO
0-15;
TiO 2
0.01-5;
CoO
0.01-3;
NiO
0.1-8; and
PbO
<7, and
a ratio of amounts of NiO to CoO that is at least 3.
2. The optical glass filter according to claim 1 , comprising a difference of diabatie at wavelengths 363 nm and 450 nm that is higher than 2:
θ(363 nm)−θ(450 nm)>2.
3. The optical glass filter according to claim 2 , comprising a difference of diabatie at wavelengths 363 nm and 650 nm that is higher than 2:
θ(363 nm)−θ(650 nm)>2.
4. The optical glass filter according to claim 1 , wherein the filter glass comprises a sum of NiO and CoO that is at most 5% by weight.
5. The optical glass filter according to claim 1 , wherein the filter glass comprises ZnO in a proportion of at most 3% by weight.
6. The optical glass filter according to claim 1 , wherein the filter glass comprises iron in a proportion of less than 0.1% by weight.
7. The optical glass filter according to claim 1 , wherein the filter glass comprises alkali metal oxides in a proportion of at least 13% by weight.
8. The optical glass filter according to claim 1 , wherein the filter glass comprises BaO in a proportion of at most 10% by weight.
9. The optical glass filter according to claim 1 , wherein the filter glass is free of absorbing oxides of an element selected from the group consisting of manganese, iron, chromium, copper, and cerium, free of an element selected from the group consisting of lanthanum, yttrium, gadolinium , ytterbium, and zirconium, free of oxides of an element selected from the group consisting of lanthanum, yttrium, gadolinium, ytterbium, and zirconium, and/or free of an ingredient selected from the group consisting of tin oxide, lithium oxide, fluoride, magnesium, and SO 3 .
10. The optical glass filter according to claim 1 , wherein the ratio of amounts of NiO to CoO that is at least 4.
11. The optical glass filter according to claim 1 , wherein the ratio of amounts of NiO to CoO that is at least 4.3.
12. The optical glass filter according to claim 1 , wherein the ratio of amounts of NiO to CoO does not exceed 14.
13. The optical glass filter according to claim 1 , wherein the ratio of amounts of NiO to CoO does not exceed 8.
14. The optical glass filter according to claim 1 , wherein the ratio of amounts of NiO to CoO does not exceed 6.
15. The optical glass filter according to claim 1 , wherein the ratio of amounts of NiO to CoO does not exceed 5.7.
16. The optical glass filter according to claim 1 , wherein the ratio of amounts of NiO to CoO does not exceed 5.
17. The optical glass filter according to claim 1 , wherein the glass filter comprises a streak class according to ISO 10110 of 4 or better.
18. A process for the production of a filter glass according to claim 1 , comprising melting of a mixture of the composition.
19. An optical glass filter, comprising a filter glass including following composition (in % by weight, based on oxides):
SiO 2
45-75;
B 2 O 3
0-5;
Al 2 O 3
0-5;
Na 2 O
0.3-15;
K 2 O
2-20;
CaO
0-15;
BaO
0-15;
TiO 2
0.01-5;
CoO
0.01-3;
NiO
0.1-8; and
PbO
<7, and
a ratio of amounts of NiO to CoO that is at least is at least 4.3 and does not exceed 5.Cited by (0)
No later patents cite this yet.
References (0)
No backward citations on record.